Yu Keping
Central Compilation Press, 2015
eBooks
Aubrey, Henry G.
National Planning Association, 1961
Buku Teks
Janda, Kenneth
Houghton Mifflin, 2000
Buku Teks SO
Kenneth Janda, Jeffrey M. Berry, Jerry Goldman, Deborah J. Schildkraut, Paul Manna
Cengage Learning, 2018
Buku Teks SO
Jerker B. Svantesson
Intersentia, 2018
eBooks